diff --git a/common/flatpak-dir.c b/common/flatpak-dir.c
index 924e4911..557c5448 100644
--- a/common/flatpak-dir.c
+++ b/common/flatpak-dir.c
@@ -3113,6 +3113,9 @@ export_desktop_file (const char   *app,
                                       "X-Flatpak-Tags",
                                       (const char * const *) tags, length);
         }
+
+      /* Add a marker so consumers can easily find out that this launches a sandbox */
+      g_key_file_set_string (keyfile, "Desktop Entry", "X-Flatpak", app);
     }
 
   groups = g_key_file_get_groups (keyfile, NULL);